Answer
$x^2=-8y$
Work Step by Step
Directrix: $y=-p~~$ (Vertical axis)
$-p=2$
$p=-2$
Parabola in the standard form with the vertex at origin (vertical axis):
$x^2=4py$
$x^2=4(-2)y$
$x^2=-8y$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 4 - 4.3 - Conics - 4.3 Exercises - Page 337: 23
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